Hello,
I'm writing a program that acts this way:
- I have a principal QWidget over which I create a QPainter,
- I draw on the widget,
- I pass the Painter to other widgets so I can use those widgets to draw on the principal one,
- Finally,in the principal widget,I call end() on the painter.

The program works properly but ends with a segmentation fault. I runned gdb and it sais that the problem was that it doesn't found qlist.h (quite strange I think).

However the output has no apparent problem:I can display the result of my painting on video and I can eventually draw it on a file. The problem arises when I try to convert the .ps image created with my program to a .pdf,in fact I obtain this error using dvipdf ( in fact I use the .ps file I create as an image in a latex text):

/usr/bin/dvipdf: line 40: 20896 Broken pipe exec dvips -q -f "$infile"
20897 Segmentation fault | gs $OPTIONS -q -dNOPAUSE -dBATCH -sDEVICE=pdfwrite -sOutputFile="$outfile" $OPTIONS -c .setpdfwrite -

I'm sure it's not a problem of the latex file or of my dvipdf because if I do the same things but without passing the QPainter to other widgets,I have no problem.

What can I do?

thanks!

What do you pass exactly to the other widgets? Is it possible that the Painter gets destroyed before your widgets try to use it?

This is the way the program behaves essentially:

class SecondWidget{//The class to whom I pass the painter
public:
SecondWidget(...,QPainter &painter,...) {p=painter;}
private:
void draw();
QPainter p;
};

SecondWidget::draw(){
p.drawSomething.......
}


class MainWidget{//The main class
...
public slot:
void paintEvent(QPaintEvent *event);
private:
SecondWidget *secondWidget;
..
};

MainWidget:aintEvent(..){
QPainter paint(this);
paint.draw...
//i draw somthing with the painter
//then I pass it to the other widget
secondWidget = new SecondWidget(paint);
secondWidget->draw();
paint.end();
}


That's all. No,I think it's impossible that the painter gets destroyed before the widget tryies to use it because the compiler whould signal it. Moreover,I don't call any .end() on the painter before the end of the program and the output I get is correct (i.e. the widgets draw what they are supposed to draw).